NGC3201
 8 iterations.
Chebyshev coeffients a(0)T_0(u)+a(1)T_1(u)+..., where u is log (r/arcsec) mapped to [-1,1]
 a(0)=    22.499 +-  0.188
 a(1)=     4.621 +-  0.305
 a(2)=     0.946 +-  0.284
 a(3)=    -0.142 +-  0.226
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=1.81
 a(0)=     7.7153
 a(1)=    -0.2703
 a(2)=     1.3796
 a(3)=    -0.1349
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set